I need to know how to turn something like line 'A' below into line 'B' using search and replace in vim. Can anyone help?

Line A:
There are 10 types of people in this world. Those who understand binary and those who don't.

Line B:
There are 10 types of people in this world.
Those who understand binary and those who don't.

As you can see, I just need to take one line and split it into three.

I know that I need to use something like

:%s/./.[newline character]/g

to do this throughout my file but don't know what to put to represent adding a newline in a search and replace command.

Any help would be appreciated.

Thanks,

Paul.

P.S. If anyone knows of a place I can find an easy-to-read guide to regular expressions I'd appreciate that too.

P.P.S. Are there any major differences between regexp format in vim and sed?

:%s/\. */.[ctrl-V][Enter]/g

seems to work. The \ before the . is important because . normally matches any character. As you can see, ctrl-V is used for escaping various things, like enter. That's not in sed but for the most part they are the same regexes as in sed.

For fun you could do this with a macro too.

Decoded:
q - begin recording macro...
1 - number 1 (bound to key 1, really, doesn't need to be a number, any alphanumeric char would do)
f - find the next ...
. - period
a - append a ...
<Enter> - carriage return/line feed
<Esc> - go back into command mode
q - ...and finish recording the macro. Now, ...
100 - 100 times
@ - execute macro ...
1 - number 1


Granted, that's imprecise because you have to know how many periods you have in the file (or over-guess and clean up afterwards), but it's just a neat little exercise.